docker-compose-nats-cluster

A three-node NATS cluster running on top of Docker Compose, for testing purposes.

Starting

To start the NATS cluster, run

$ docker-compose up
(...)
nats-2_1  | [1] 2020/03/07 13:40:29.890917 [INF] Starting nats-server version 2.1.4
(...)
nats-1_1  | [1] 2020/03/07 13:40:29.841022 [INF] Starting nats-server version 2.1.4
(...)
nats-3_1  | [1] 2020/03/07 13:40:29.895016 [INF] Starting nats-server version 2.1.4
(...)

Connecting

To connect to the NATS cluster, point your NATS client at one of 127.0.0.1:{14222,24222,34222}.

Example

Install nats-pub and nats-sub:

$ go get github.com/nats-io/nats.go/examples/nats-pub
$ go get github.com/nats-io/nats.go/examples/nats-sub

Point nats-sub at nats://127.0.0.1:14222 and at the foo subject:

$ nats-sub -s nats://127.0.0.1:14222 foo
Listening on [foo]

Now, in another shell, point nats-pub at nats://127.0.0.1:24222 and nats://127.0.0.1:34222 and at the foo subject:

$ nats-pub -s nats://127.0.0.1:24222 foo bar
Published [foo] : 'bar'
$ nats-pub -s nats://127.0.0.1:34222 foo baz
Published [foo] : 'baz'

By then, you should start seeing messages arriving in the shell where nats-sub is running:

$ nats-sub -s nats://127.0.0.1:14222 foo
Listening on [foo]
[#1] Received on [foo] : 'bar'
[#2] Received on [foo] : 'baz'

Stopping

To stop the NATS cluster, hit Ctrl+C.

Destroying

To destroy the NATS cluster, run

$ docker-compose down
Removing docker-compose-nats-cluster_nats-1_1 ... done
Removing docker-compose-nats-cluster_nats-3_1 ... done
Removing docker-compose-nats-cluster_nats-2_1 ... done
Removing network docker-compose-nats-cluster_main

License

Copyright 2017-2020 bmcustodio

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.